brancher-val.hpp

00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main author:
00004  *     Christian Schulte <schulte@gecode.org>
00005  *
00006  *  Copyright:
00007  *     Christian Schulte, 2008
00008  *
00009  *  Last modified:
00010  *     $Date: 2011-05-11 12:44:17 +0200 (Wed, 11 May 2011) $ by $Author: tack $
00011  *     $Revision: 12001 $
00012  *
00013  *  This file is part of Gecode, the generic constraint
00014  *  development environment:
00015  *     http://www.gecode.org
00016  *
00017  *  Permission is hereby granted, free of charge, to any person obtaining
00018  *  a copy of this software and associated documentation files (the
00019  *  "Software"), to deal in the Software without restriction, including
00020  *  without limitation the rights to use, copy, modify, merge, publish,
00021  *  distribute, sublicense, and/or sell copies of the Software, and to
00022  *  permit persons to whom the Software is furnished to do so, subject to
00023  *  the following conditions:
00024  *
00025  *  The above copyright notice and this permission notice shall be
00026  *  included in all copies or substantial portions of the Software.
00027  *
00028  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00029  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00030  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00031  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00032  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00033  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00034  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00035  *
00036  */
00037 
00038 namespace Gecode {
00039 
00046 
00047   class EmptyValSelChoice {
00048   public:
00050     size_t size(void) const;
00052     void archive(Archive& e) const;
00053   };
00054 
00060   template<class _View, class _Val>
00061   class ValSelBase {
00062   public:
00064     typedef _View View;
00066     typedef _Val Val;
00068     typedef EmptyValSelChoice Choice;
00070     static const unsigned int alternatives = 2;
00072     ValSelBase(void);
00074     ValSelBase(Space& home, const ValBranchOptions& vbo);
00076     EmptyValSelChoice choice(Space& home);
00078     EmptyValSelChoice choice(const Space& home, Archive& e);
00080     void commit(Space& home, const EmptyValSelChoice& c, unsigned a);
00082     void update(Space& home, bool share, ValSelBase& vs);
00084     void dispose(Space& home);
00085   };
00087 
00088 
00089   // Empty value selection choice
00090   forceinline size_t
00091   EmptyValSelChoice::size(void) const {
00092     return sizeof(EmptyValSelChoice);
00093   }
00094   forceinline void
00095   EmptyValSelChoice::archive(Archive& e) const { (void)e; }
00096 
00097   // Value selection base class
00098   template<class View, class Val>
00099   forceinline
00100   ValSelBase<View,Val>::ValSelBase(void) {}
00101   template<class View, class Val>
00102   forceinline
00103   ValSelBase<View,Val>::ValSelBase(Space&, const ValBranchOptions&) {}
00104   template<class View, class Val>
00105   forceinline EmptyValSelChoice
00106   ValSelBase<View,Val>::choice(Space&) {
00107     EmptyValSelChoice c; return c;
00108   }
00109   template<class View, class Val>
00110   forceinline EmptyValSelChoice
00111   ValSelBase<View,Val>::choice(const Space&, Archive&) {
00112     EmptyValSelChoice c; return c;
00113   }
00114   template<class View, class Val>
00115   forceinline void
00116   ValSelBase<View,Val>::commit(Space&, const EmptyValSelChoice&, unsigned int) {}
00117   template<class View, class Val>
00118   forceinline void
00119   ValSelBase<View,Val>::update(Space&, bool, ValSelBase<View,Val>&) {}
00120   template<class View, class Val>
00121   forceinline void
00122   ValSelBase<View,Val>::dispose(Space&) {}
00123 
00124 }
00125 
00126 // STATISTICS: kernel-branch